Flue gas waste heat recovery system for gas thermal equipment

Abstract

The invention discloses a flue gas waste heat recovery system for gas thermal equipment. A discharge flue of the gas thermal equipment is communicated to a gas inlet of a heat pipe air heater; an exhaust port of the heat pipe air heater is communicated to a gas inlet of a condensation type feed water heater; an exhaust port of the condensation type feed water heater is communicated to a chimney; an air supply outlet of a variable frequency air feeder is communicated to an air inlet of the heat pipe air heater; an air outlet of the heat pipe air heater is communicated to an inlet of combustion equipment; a water inlet of a variable frequency pulsing water feeding pump is communicated to a water feeding tank; a drainage port of the variable frequency pulsing water feeding pump is communicated to a water inlet of the condensation type feed water heater; a water outlet of the condensation type feed water heater is communicated with heat using equipment; a programmable controller periodically changes a Hedstrom number of the variable frequency pulsing water feeding pump by a program, so that a flow velocity in the condensation type feed water heater is periodically mutated, and thus, the technical problem of low energy-saving rate of an existing gas thermal equipment heat energy recovery mode is solved, and energy saving efficiency of the system is effectively improved.

Description

technical field [0001] The invention relates to the technical field of waste heat recovery of gas thermal equipment, in particular to a waste heat recovery system for flue gas of gas thermal equipment. Background technique [0002] Fossil fuels, as non-renewable resources, are facing depletion in the process of global industrialization, and energy conservation and emission reduction have become a global theme. There are nearly 200,000 sets of gas-fired thermal equipment in operation nationwide, and the annual combustion of gas fuel is about 40-70 billion cubic meters. While consuming a huge amount of resources day after day, the combustion product CO 2 The emissions are about 77 million to 135 million tons per year, and the NOx emissions are correspondingly huge. [0003] The main component of gaseous fuel is CmHn, the CH ratio is relatively small, and the H element occupies a dominant position in the share. During the process of gaseous fuel in the furnace, the H element...

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Problems solved by technology

[0006] The embodiment of the present invention solves the technical problem of low energy saving rate in the existing gas thermal equipment heat recovery mode by providing a flue gas waste heat recovery system for gas thermal equipment

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